ANSWERS: 2
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The signs most commonly used to designate trail difficulty in the United States and Europe are green circles for easy slopes, blue squares for intermediate runs, and black diamonds for difficult trails. Double black diamonds are sometimes used to designate especially difficult terrain.
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The European system rates the easiest slopes as green, moderate as blue, difficult as red and very difficult as black. There is no diamond system in Europe, although there are 'ski trails' in some countries, which are not pisted, but are monitored by the mountain patrols. The difference is that in the USA, you can safely ski almost everywhere with the ski area boundary, whereas in Europe, it is strongly discouraged to leave the marked pistes without a guide. It seems that a European red is roughly equivalent to a US single black.
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